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Goodwill and Core Deposit Intangibles
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Core Deposit Intangibles
Goodwill and Core Deposit Intangibles

At December 31, 2017, the Company had goodwill of $493 million. Additions to goodwill of $391 million included $122 million from the PLZZ acquisition and $269 million from the HEOP acquisition. The following table presents changes in the carrying value of goodwill for the periods indicated:
 
2017
 
2016
 
(dollars in thousands)
Balance, beginning of year
$
102,490

 
$
50,832

Goodwill acquired during the year
390,839

 
51,658

Impairment losses

 

Balance, end of year
$
493,329

 
$
102,490

Accumulated impairment losses at end of year

 


The Company’s goodwill was evaluated for impairment during the fourth quarter of 2017, with no impairment loss recognition considered necessary.

At December 31, 2017, the Company had $43.0 million of CDI. Additions to CDI of $39.7 million included $11.6 million from the PLZZ acquisition and $28.1 million from the HEOP acquisition. The Company's change in the gross amount of core deposit intangibles and the related accumulated amortization consisted of the following at December 31:

 
2017
 
2016
 
2015
 
(dollars in thousands)
Gross amount of CDI:
 
 
 
 
 
Balance, beginning of year
$
15,102

 
$
10,782

 
$
7,876

Additions due to acquisitions
39,707

 
4,320

 
2,906

Balance, end of year
54,809

 
15,102

 
10,782

Accumulated amortization:
 
 
 
 
 
Balance, beginning of year
(5,651
)
 
(3,612
)
 
(2,262
)
Amortization
(6,144
)
 
(2,039
)
 
(1,350
)
Balance, end of year
(11,795
)
 
(5,651
)
 
(3,612
)
Net CDI, end of year
$
43,014

 
$
9,451

 
$
7,170


The estimated aggregate amortization expense related to our core deposit intangible assets for each of the next five years is $8.4 million, $7.3 million, $6.5 million, $5.4 million, and $4.5 million. The Company’s core deposit intangibles is evaluated for impairment if events and circumstances indicate possible impairment. Factors that may attribute to impairment include customer attrition and run-off. Management is unaware of any events and/or circumstances that would indicate a possible impairment to the core deposit intangibles.